Depends on the type of coating if it will come off. Some premium brands have an e-coating that seems to hold up well to the rust. The OEM BMW front rotor uses an aluminum cap, this prevent the rust from the rotor inner hub to be seen (I do not know if this is the reason for the cover). I have found that the G2 Ceramic coating seems to hold up reasonably well the the heat if you put it on (at least on the rear hub).
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2022 Porsche 911 Cabriolet Agate Grey/Black PDK
2019 440i M-Sport Smoke Topaz Metallic/Opel (Sold)
2014 335i M-Sport Black/Beige MPPK/MPE (Totaled)
2013 328i Sport xDrive Imperial Blue/Grey (Sold)
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